Multistage centrifugal, turbine, or similar pump.



No. 765,935. PATENTBD JULY 26, 1904,

P. RAY. MULTISTAGE GBNTRIPUGAL, TURBINE, 0R SIMILAR PUMP.

APPLICATION FILED 0GT.1, 1903.

N0 MODEL.

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UNITED STATES Patented July 26, 1904.

PATENT OEEICE.

FREDERICK RAY, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO HENRY R. VORTHINGTON, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

MULTISTAGE CENTRIFUGAL, TURBINE, OR SIMILAR PUMP.

SPECIFICATION forming part of Letters Patent No. 765,935, dated July 26, 1904. Application led October 1, 1903. Serial No. 175,267. (No model.)

.To fl/ZZ 1071/0711/ it 711./1/7/ concern:

Be it known that I, FREDERICK RAY,`a citizen of the United States, residing at East Orange, county of Essex, and State of New 5 Jersey, have invented certain new and useful Improvements in Multistage Centrifugal, Turbine, or Similar Pumps, fully described and represented in the following specification and the accompanying drawings, forming a part 1o of the same.

The object of the present invention is to provide an improved centrifugal, turbine, or like pump for obtaining different discharge-pressures with the pump running at constant speed.

I secure the result desired by providing the impellers of a multi-impeller centrifugal, turbine, or like pump with separate suctions and means for opening and closing them, so that the suction of the iirst impeller or of a subzo sequent impeller of the series may be used and the liquid acted upon by the number of impellers desired on its way to the delivery, according to the discharge-pressure required.

In the accompanying drawing, the invention is shown as applied to a two-stage turbinepump of a well-known type, and from a description of this pump the application of the invention -in connection with a multistage pump having any number of impellers will 3o readily be understood.

In the drawing, which is a central section of the pump taken longitudinally of the axis, A is the casing inclosing the two impellers B B. The first impeller B takes its suction from the chamber C at the end of the casing, which is supplied through suction-pipe D, controlled by valve E, and this impeller B delivers the water through the diifusing-ring F to the chamber C', forming the suction-chamber for 40 the second impeller-B. This suction-chamber C for the second impeller is provided also with suction-pipe D', controlled by valve E. The second impeller B delivers its water through the diffusing-ring Fl and deliverychamber G to the outlet H.

Full pressure is obtained by closing suction Dl by valve E' and opening suction D by valve E. The water entering from suction D through suction-chamber C is then acted on successively by the two impellers B B' and then de- 5o livered through outlet H. Lower pressure is obtained by closing suction D by valve E and opening suction D' by valve E. The water then enters suction-chamber C from suction D and is acted on only by impeller` B. 5 5

When the impeller B is not in usethat is, when the suction D' is used-the impeller B being on the suction side of the working impeller B runs in air, and this is an important advantage of my construction as compared 6o with constructions in which the non-working impeller is on the force side of the working impeller, as the friction, wear, and tendency to leakage is thus greatly reduced. It will be found that the suction-chamber C and the im- 6 5 peller-chamber Will soon be emptied of water in operating the pump with the suction D open. If in any case it be desired to admit air to the chamber C in starting the pump with i the suction D. this can readily be done by an 7o air-valve on chamber C.

It will be understood that the invention is not limited to the special type of pump shown, but that it is applicable generally in multistage turbine, centrifugal, or like pumps.

What is claimed is- A centrifugal, turbine or like pump having a plurality of impellers arranged in series, separate suctions for the impellers, and means for openingand closing the suctions of the 8o diiferent impellers to take the suction on the iirst or subsequent impeller according to the discharge-pressure desired.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

FREDERICK RAY.

Witnesses:

C. J. SAWYER, W. H. KENNEDY. 

